Blowing device



Oct. 5 1926. 1,601,713

Y L. c. BAYLES BLOWING DEVICE Filed Oct. 19, 1925 V INVENTOR. ficwa'dflb fyi x BY 1175 ATTO EY.

Patented Oct. 5, 1926.

UNITED STATES v 1,601,713 PATENT OFFICE.

LEWIS O. BAYLES, OF EASTON, PENNSYLVANIA, ASSIGNOR T0 INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

BLOVING DEVICE.

Application filed October 19, 1925. Serial No. 63,260.

This invention relates to rock drills, but more particularly to a blowing device for fluid actuated rock drills of the hammer type.

The objects of the invention are to selectively admit an uninterrupted supply of pressure fluid under full line pressure to the drill steel for cleansing the drilled hole and to hold the valve and the piston immovable while such pressure fluid is passing through the drill steel.

Other objects will appear hereinafter.

The invention consists of the combinations of elements, features of construction, and arrangement of parts having the general mode of operation, substantially as hereinafter described and more particularly pointed out in the appended claims and illustrated in the accompanying drawings, in-

which Figure 1 is a longitudinal diagrammatic view in section of so much of a rock drill as will serve to illustrate the invention,

Figure 2 is a view similar to Figure 1 showing the reciprocating parts in another position, and

Figure 3 is a view-similar to Figures 1 and 2 showing the manner in which pressure fluid is admitted to the drill steel.

Referring to the drawings, the invention is shown embodied in a drill having a cylinder A provided with a reciprocatory hammer piston B. A front head C is arranged'at the front end of the cylinder A and is centralized with respect thereto by a front cylinder washer D. The cylinder A and the front head C are preferably held in operative position by the usual side bolts" (not shown).

Disposed within the front head C is a rotatable chuck E having ribs F which coop erate with flutes G formed on an extension H of the piston B to prevent relative rotation between said piston and the chuck E. The front end of the chuck E is bored as at J to receive a drill steel K and to hold said drill steel against rotation with respect thereto.

In order toimpart rotary movement to the piston B and consequently the drill steel K for keeping the drill steel free within the drill hole, a rifle bar L engages the piston B in the usual manner and may be held in any convenient manner against rotation while the piston is traveling in one direction and to permit rotation of the rifle bar with the piston during the opposite stroke of the piston. The Title bar Lin this instance is adapted to project through a back cylinder washer 0 fixed in the rear end of the cylinder A to form a closure for said cylinder, the entire construction not being shown. A valve chest P is in this instance arranged longitudinally of the cylinder A and has a valve chamber Q, in which chamber is arranged a spool type distributing valve R, the type of valve here illustrated is like that covered in the 'copending application of W. A. Smith, Serial No. 23,181, filed, April 15, 1925, although any suitable valve in which kicker ports are employed for actuating the valve may be used. The valve shown has a central head S which controls a central inlet port T and has end heads U and V for controlling the main exhaust port W and X respectivelyformed on opposite sides of the inlet port T. Theends of the chamber Q are closed by bushings Y which also serve as stops for limiting the travel of the valve R and form valve chestspacesY and Y between the bushings and the valve end heads.

Motive fluid for actuating the piston is supplied to'the' rear and front ends of the cylinder through supply passages Z and 6 respectively communicating with the valve chamber Q. on opposite sides of the central inlet port T.

Usually in drills employing valves of the type indicated in the drawings, kicker ports are used for controlling the action .of the valve; Such kicker ports may be crossed as 1n the present instancev 111 wh ch a kicker port c leading from a point rearward of the center oftlie cylinder A communicates with the front end space Y of the valve chamber Q to admit pressure fluid to said front end for throwing the valve rearwardly. A second kicker port or passage cl communicating with the cylinder A at a point forwardly of its center extends to the rear end space Y of the valve chamber Q to admit pressure fluid to said rear end for throwing the valve forwardly.

A hollow longitudinal bore 6 formed in the valvechest in this instance contains an auxiliary valve f shown as a slidable valve although it could be of any suitable form and construction for establishing communication between the supply of pressure fluid and one valve space Y and at the same time to open the opposed valve space Y to atmosphere, so that the valve is held at one end of its travel and the piston is held at the rearward end of its stroke to permit pressure fluid to blow down the drill steel from the front end of the cylinder.

A normally closed auxiliary port 9 connects the valve chest space Y with any point supplied with live pressure fluid, as for instance the supply port I), and a groove it in the valve f opens communication through said auxiliary port g, as shown in Figure 3. Two auxiliary ports 7' and 7c are adapted to connect the valve chest space Y with atmosphere through the exhaust port IV when placed in communication by the groove 0 in the valve The valve is provided with the head or handle 32 and the retracting spring q at the opposite end.

In the operation of the device, the ham mer piston B functions as usual and as de scribed in the said copending application, Serial No. 23,181, when the auxiliary valve is in the retracted position indicated in Figures 1 and 2. When the valve f is forced inwardly against the spring 9 as in Figure 3, the kicker ports 0 and ct are not disturbed, but live pressure fluid is continuously supplied to the valve chest space Y to hold the valve in rearward position, and the opposite valve chest space is vented directly to atmosphere through the ports and k and exhaust port W, so that the pressure in said space Y is substantially zero. The live pressure fluid supplied to the forward end of the cylinder A holds the piston in rearward position and at the same time blows continuously down the piston flutes and through the hollow drill steel for cleansing purposes.

I claim 1. In a fluid actuated rock drill of the hammer type, the combination of a cylinder and reciprocatory piston, a valve chest and distributing valve therein controlling both the supply and exhaust of pressure fluid for the cylinder, valve actuating ports between opposed spaces in the valve chest and the cylinder bore for supplying pressure fluid ior actuating the valve, and means for ad niitting pressure fluid to one valve chest space and for establishing communication between the opposed space and the atmosphere, whereby the valve is held at one end of its travel and the piston is held at the rearward end or" its stroke to permit blowing to be eflected.

2. In a fluid actuated rock drill of the hammer type, the combination of a cylinder and reciprocatory piston, a valve chest and distributing valve therein controlling both the supply and exhaust of pressure fluid for the cylinder, valve actuating ports between opposed spaces in the valve chest and the cylinder bore for supplying pressure fluid for actuating the valve, and an auxiliary valve for establishing communication between one valve chest space and the inlet supply of pressure fluid and for opening the other opposed space to atmosphere, whereby the valve is held at one end of its travel and the piston is held at the rearward end of its stroke to permit. blowing to be efl'ected.

3. In a fluid actuated rock drill of the hammer type, the combination of a cylinder and reciprocatory piston, a valve chest and distributing valve therein controlling both the supply and exhaust or pressure fluid for the cylinder, valve actuating ports between opposed spaces in the valve chest and the cylinder bore for supplying pressure fluid for actuating the valve, an auxiliary pressure fluid port for one of said valve chest spaces, and two ports for; the other valve chest space, one of which ports leads to atmosphere, and an auxiliary valve for opening said auxiliary pressure fluid port and for connecting said two ports, whereby the valve is held at one end of its travel and the piston is held at the rearward end of its stroke to permit blowing to be effeet-ed.

In testimony whereof I have signed this specification.

LEl/VIS C. BAYLES. 

